OWallet v0.9.7

1. 下载新版本时，会打开本地默认浏览器下载新版本
2. 更新了oep4 token交易记录错误的bug
3. 更新了changelly url
4. 更新了授权质押相关的一些文案。

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1. will open local default browser to download new version;
2. fix the display bug of oep4 token transaction history;
3. update the url of changelly;
4. update some texts of authorization state;

File hashes
File: OWallet-0.9.7-Mac-Setup.dmg
SHA256: cef0790f5177575aff559a1d51c2146a8a1add51e7d23f0dbdc0d3d01ae31b50
File: OWallet-0.9.7-Windows-Setup.exe
SHA256: b085569185a1807bede7761be30833a4bea0ab055b4b19982f0680a6e50a0719
File: OWallet-0.9.7-Linux-Setup.AppImage
SHA256: e0381884549cc9b4e9a67e6eb6a14b88473525246b98f162e96e2ec791d3863a